The SSM-17H is fully compatible with all the handheld transceivers that have a speaker mic connection. The audio power, quality and design of the SSM-17H are improvements as compared to the MH-57A4B.
SSM-21A Speaker Mic for HX890, HX400, HX400IS, HX380, HX40 & HX210Standard Horizon SSM-21A submersible speaker microphone with heavy-duty belt clip. Compatible with Standard Horizon HX890,...
Bluetooth Headset for HX891BTThe SSM-BT20 is a wireless Bluetooth 5.0 headset designed for all Standard Horizon Bluetooth-compatible transceivers.Great for Boaters needing handsfree VHF operation...